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                                                                                                title="experimental::as_single_t::as_single_t (1 of 2 overloads)">experimental::as_single_t::as_single_t
                (1 of 2 overloads)</a>
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    <p>
        Default constructor.
    </p>
    <pre class="programlisting"><span class="keyword">constexpr</span> <span class="identifier">as_single_t</span><span
            class="special">(</span>
    <span class="identifier">default_constructor_tag</span>  <span class="special">=</span> <span class="identifier">default_constructor_tag</span><span
                class="special">(),</span>
    <span class="identifier">CompletionToken</span> <span class="identifier">token</span> <span class="special">=</span> <span
                class="identifier">CompletionToken</span><span class="special">());</span>
</pre>
    <p>
        This constructor is only valid if the underlying completion token is
        default constructible and move constructible. The underlying completion
        token is itself defaulted as an argument to allow it to capture a source
        location.
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